Automotive brake



Jully 10,1923.

W. C. M WHIRTER AUTOMOTIVE BRAKE Filed June 29, 1922 M F e 4 3/, 5 s 2 6 2 4 2 a 2 u 2 7 h xi 2 iNVENTOR WILLIAM QMOWHIRTER did Pistented duly id, @255 entree WESTKHGHQUfiE BRAKE CQMPANY, 93F WILMERIDING, PENNSYLVANIA, A CGE Z= POE-ATM??? @E FENNSYLVANIA.

AUEGMOTNE BRAKE.

Application filed June 29, 1922. serial lilo. lltlfildtl.

To all whom it may concern Be it known that 1, 'WILLIAM C. MCWHIR 'rnn, a citizen of the United States, residing at Wilkinshurg, in the county of Allegheny and State of Pennsylvania, have invented new and useful Improvements in Automotive Brakes, of which the following is a specification.

This invention relates to fluid pressure brakes, end more particularly to a fluid pressure brake system for an automotive vehicle.

The principal object of my invention is to provide a fluid pressure brake system for automotive vehicles in which a reserve supply of fluid under pressure is available for braking purposesin case-of an emergency where the usual braking pressure has become depleted below the point at which the desired braking action can be obtained.

Other objects and advantages will appear in the "following more detailed description of the invention.

In the accompanying drawing, the single figure is a diagrammatic vievv, partly in secgion, or an automotive vehiclefluid pressure rake system embodying my inventlon.

As shown in the drawing, the fluid pressure brake equipment msy comprise an opplicsticn and release valve device 1, adapted to be controlled by a hrelre valve device 2, an emergency valve device 3, edapted to be controlled by a brske valve s brake cylinder 5, which may be the diaphragm type, an emergency reservoir 6, and a service a reservoir 7.

The application and release vslve device 1 m comprise a casing containing a, flexible disp irsgm 8 adapted to operate a release slide valve 9 end a poppet type application valve 10, the diaphragm chamber- 11 being connected by pipe 19; to the brake valve 2. The emergency valve device 3 may comprise a casing containing a flexible disphrsgm 13 for opernting an spiicntion vslve 14; end it valve 15, the diapc rag'm chamber 16 being connected to pipe 17 to the brake vslve device at.

The service reservoir 7 may he cherged with under pressure by connecting the reservoir to one out the cylinders the internal combustion-engine which drives the cer, so that pert of the gases genereted on the explosion stress 0' gins through the pipe 13, past the non-s ,one side to the pressure of an adjustable spring 24 and adapted to operate e valve 25 for controlling communication from valve chamber 26 through pipe :27 to the service reservoir 7.

The valve chamber 26 is connected by pipe 28 to the emergency reservoir 6 so that the diaphragm 23 is subject to the pressure in emergency reservoir 6. A safety valve device 31 me be interposed in the pipe 27, so that if tlie pressure should exceed as predetermined degree, say 150 pounds, for

example, the safety valve will open and relieve the reservoir of the excess pressure.

The spring 24 of the governor 22 may be adjusted for the pressure at which it is desired to cut 05 and retain the emergency reservoir pressure, say 60 pounds.

In operation, the reservoirs b and 7 ere charged with fluid under pressure from the engine. cylinders 29' end 30 end when the pressure in the emergency reservoir 6 has been increased slightly above 80 pounds, or

the pressure at which the spring 2% may he set, the diaphragm 23 will be operated to open the valve 25, so thst both reservoirs 6 end 7 are connected end fluid is supplied from both reservoirs for braking purposes so long as the pressure remains above pounds.

In normal service broking, the brake velve 2 is operated fluid is supplied from the service reservoir 7 through pipe 32 the broke vslve 2 to pipe 12- and chsmber 3.3., hrsgm 8 is then opereted to move the re e valve 9 to close the exhaust port 33 win the application 10 is opened pipe 3 to 3 lleading to the valve 15 of the emergency valve device @ne side of the 13 the emerso that is supplied from till gency valve device is connected to pipe 28, so that fluid from the emergency reservoir 6 is supplied thereto and fluid equalizes from this side of the diaphragm through a restricted port 35 to diaphragm chamber 16. The fluid premures on opposite sides of the diaphragm 13 being'equalized, the tension of the diaphragm holds the valve it closed and the valve 15 open.

Under the above conditions, fluid flows through pipe 84: past the 0 en valve 15 to pipe 36 and the brake c lin er 5 to ellect an application of the hrares.

ll the ressures in the reservoirs 6 and 7 should fall below 60 pounds or the setting of the spring 2% of the governor 22, the diaphragm 23 Will be operated to close the valve 25 and thereafter, the pressure in the emergency reservoir '6 Will he availahe for emergency braking, in order to apply the hralres in emergency, the hralre valve l is operated so as to vent fluid from diaphragm chamber 16 through pipe 17. The diaphragm 13 is then operated by the fluid pressure below the diaphragm so as to slow the valve 15 and open the valve 1d. Fluid under pressure from the emergency reservoir 6 is then supplied the bralre cylinder from pipe 28, post the open valve it to pipe 36 and thence to the brake cyl inder 5.

Having now descrihed my invention, What ll claim as new and desire to secure loy Letters Patent, is:--

1. in a pressure hralre, tor automotive vehicles, the comhination with a service and an emergency ervoir normally in communication and menus for cutting oil communication t emergency reservoir to the service .31, Joir upon predetermined reduction in in scrvi reservoir, of a service valve device normally controlling the supply tluid from the service reservoir e ect on application the .nd valve device cc hrom ins ore the emergency reservoir to edect an appli cation or the hrahes.

2. In a fluid pressure hralre, for automo= tive vehicles, the combination with service and an emergency reservoir normally in communication and means for cutting ofi communication from the emergency reservoir to the service reservoir upon a predetermined reduction in pressure in the service reservoir, oi a service valve device for normally controlling the supply of fluid from the service reservoir to efiect an application of the brakes and an emergency valve device "tor controlling the supply oi? fluid from the emergency reservoir to effect an application of the hralres when the pressure in the service reservoir has heen reduced helovv the predetermined degree.

3, In a fluid pressure hralre :lor automotive vehicles, the combination with a service reservoir from Which fluid under pressure is supplied lor'service hralring and emergency reservoir from "which fluid under pressure is supplied for emergency braking, of internal combustion engine cylinders and means for charging the service reservoir wi h fluid under pressure from one engine cylinder and the emergency reservoir from another engine cylinder,

4. lln a fluid pressure hralre 'lor automotive vehicles, the comhination with serv ice reservoir lrom which tluid under pr sure is supplied for service hralring end an emergency reservoir from Which tluid under pressure is supplied for emergency bruising of internal combustion engine cylinders means for charging the service reservoir with fluid under pressure .n' e. cylinder and the emergency reservoir another engine cylinder a isvice tor opening communication hetvveen mservoirs upon a predetermined pressure in the emergency reservoirs.

in testimonywhereol l' have hereunto 

